Several properties, including barrier to water vapor, gas, flavor
or light, as well as flexibility or rigidity, are necessary for the production
of food packaging. These features are hardly ever found
in one specific starting material. If on one hand a polymer could
be advantageous for having mechanical resistance, on the other
hand it could be extremely inconvenient in relation to other properties,
such as transparency and permeability [1,2]. Thus, the food
packaging industry needs to develop multilayer films, containing
different polymers. Multilayer films may be manufactured by lamination
or co-extrusion. These physical processes combine different
polymers,originating a film with especial chemical, physical and
mechanical properties [3,4]. Another material that is used in these
packages is the aluminum, preventing the food from the effect of
sunlight and ultraviolet radiations [5].